CI: Test with OCaml 5.3.0 and 5.4.0

Author: shym

.github/workflows/build.yml

@@ -22,10 +22,19 @@ jobs:
         include:
           - ocukver: dev
             ukver: dev
+            ocver: 5.4.0
+          - ocukver: dev
+            ukver: dev
+            ocver: 5.3.0
           - ocukver: dev
             ukver: 0.18.0
+            ocver: 5.4.0
+          - ocukver: dev
+            ukver: 0.18.0
+            ocver: 5.3.0
           - ocukver: 1.0.0
             ukver: dev
+            ocver: 5.3.0
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -48,7 +57,7 @@ jobs:
       - name: Install OCaml compiler
         uses: ocaml/setup-ocaml@v3
         with:
-          ocaml-compiler: 5.3.0
+          ocaml-compiler: ${{ matrix.ocver }}
           # We need to pin our packages with their real version numbers, to
           # satisfy the dependency bounds of the other packages
           opam-pin: false